Lemma 2.7 [1]} 
Let \(f(z)\)  be a non constant meromorphic function in the complex plane, and let \(R(f)=\frac{P(f)}{Q(f)}\) , where
\(P(f)=\sum _{k=0}^{p}a_{k}(z)f^{k} \hspace{6.42004pt} \text{and}\hspace{6.42004pt} Q(f)=\sum _{j=0}^{q}b_{j}(z)f^{j}\) 
